CN208569019U - A kind of three-phase virtual load generator - Google Patents
A kind of three-phase virtual load generator Download PDFInfo
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- CN208569019U CN208569019U CN201820830923.3U CN201820830923U CN208569019U CN 208569019 U CN208569019 U CN 208569019U CN 201820830923 U CN201820830923 U CN 201820830923U CN 208569019 U CN208569019 U CN 208569019U
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Abstract
The utility model provides a kind of three-phase virtual load generator, the power supply includes governor circuit, DC power supply circuit, voltage conversion circuit, current converter circuit, voltage sampling circuit and current sampling circuit, governor circuit sends the first PWM drive signal to voltage conversion circuit, and voltage conversion circuit is exported according to the converting direct-current voltage into alternating-current voltage that the first PWM drive signal provides DC power supply circuit；Governor circuit sends the second PWM drive signal to current converter circuit, and current converter circuit is converted into alternating current according to the DC current that the second PWM drive signal provides DC power supply circuit and exports；Voltage sampling circuit obtains the voltage sampling signal of the voltage output end of voltage conversion circuit, and voltage sampling signal is sent to governor circuit by voltage sampling circuit；Current sampling circuit obtains the current sampling signal of the current output terminal of current converter circuit, and current sampling signal is sent to governor circuit by current sampling circuit.
Description
Technical field
The utility model relates to AC power source technical fields, specifically, being related to a kind of electric energy for electric power O&M scene
The three-phase virtual load generator of metering device offer three phase sine alternating current wave.
Background technique
Electric power metering device is sold in electric energy in Utilities Electric Co. to play a significant role, in order to guarantee correct electrical energy measurement,
Electric power O&M scene usually requires the test that multi-functional is carried out to electric power metering device, to ensure the accurate of electric power metering device
Property.When carrying out functional test to electric power metering device, for example, carrying out decompression, defluidization, equal function of breaking to electric power metering device
When test, it usually needs provide three-phase sine-wave AC power source to electric power metering device.
And existing three phase mains technical solution is mostly to be directed to the large-scale fixed class equipment of laboratory research and development, equipment operation
Mostly by indoor reserved 220V outlet, equipment is not only large-scale can not also to be moved, in complicated electric power O&M site environment
Under be not almost available.
Summary of the invention
The main purpose of the utility model be to provide it is a kind of can be electric power O&M field electric power metering device carry out electrical measurement
The three-phase that a variety of electric power metering devices in electric power O&M place are carried out with fast powering-up can be realized without external any power supply for examination
Virtual load generator.
In order to achieve the above-mentioned main objectives, three-phase virtual load generator provided by the utility model include governor circuit, it is straight
Galvanic electricity source circuit, voltage conversion circuit, current converter circuit, voltage sampling circuit, current sampling circuit, control relay circuit
And communication interface circuit, DC power supply circuit are electric to governor circuit, voltage conversion circuit, current converter circuit, voltage sample
Road, current sampling circuit and communication interface circuit provide power supply；Governor circuit sends the first PWM driving to voltage conversion circuit
Signal, voltage conversion circuit are converted into alternating current according to the DC voltage that the first PWM drive signal provides DC power supply circuit
Pressure output；Governor circuit sends the second PWM drive signal to current converter circuit, and current converter circuit drives according to the 2nd PWM
The DC current that signal provides DC power supply circuit is converted into alternating current output；Voltage sampling circuit obtains voltage conversion electricity
Voltage sampling signal is sent to governor circuit by the voltage sampling signal of the voltage output end on road, voltage sampling circuit；Electric current is adopted
Sample circuit obtains the current sampling signal of the current output terminal of current converter circuit, and current sampling circuit sends out current sampling signal
It send to governor circuit；Control relay circuit is electrically connected with governor circuit and current output terminal respectively, and governor circuit is to relay
Control circuit sends control signal, and control relay circuit controls the on or off of current output terminal according to control signal；It is main
It controls circuit and passes through communication interface circuit and host computer information exchange.
By above scheme as it can be seen that the utility model is by setting voltage conversion circuit and current converter circuit, by direct current
The DC power supply of source circuit is converted into AC power source, is electric power O&M scene convenient for providing alternating voltage to electric power metering device
Its necessary test environment is provided.Meanwhile voltage sampling circuit and current sampling circuit is set, voltage conversion circuit is exported respectively
Voltage signal and the current signal of current converter circuit output be monitored, and feed back to governor circuit, be convenient for governor circuit
According to the driving signal that the data point reuse of feedback exports, and then the voltage and current for reaching the voltage conversion circuit being precisely controlled turns
Change the electric current output of circuit.In addition, governor circuit can also carry out information exchange by communication interface circuit and host computer, convenient for upper
Position machine controls mobile power source.In addition, due to needing to export different ranges when three-phase virtual load generator exports electric current,
Therefore it needs to switch over, when governor circuit receives the current parameters of setting, can determine to be switched to corresponding range automatically, lead to
Control relay circuit overdrive to achieve the purpose that switching.
In further embodiment, voltage conversion circuit includes the first IGBT circuit module, the first LC filter circuit and the
One isolating transformer, the first IGBT circuit module are electric with governor circuit, DC power supply circuit and the first LC filter circuit respectively
Connection, the output end of the first LC filter circuit are electrically connected with the first isolating transformer.
It can be seen that d. c. voltage signal is converted into square wave by the first IGBT circuit module of setting by voltage conversion circuit
Square-wave signal is filtered into smooth sine wave signal using the first LC filter circuit by signal, is become finally by the first isolation
DC voltage is converted to alternating voltage output to realize by depressor output voltage.
In further embodiment, current converter circuit includes the 2nd IGBT circuit module, the 2nd LC filter circuit and the
Two isolating transformers, the 2nd IGBT circuit module are electric with governor circuit, DC power supply circuit and the 2nd LC filter circuit respectively
Connection, the output end of the 2nd LC filter circuit are electrically connected with the second isolating transformer.
It can be seen that DC current signal is converted into square wave by the 2nd IGBT circuit module of setting by current converter circuit
Square-wave signal is filtered into smooth sine wave signal using the 2nd LC filter circuit by signal, is become finally by the second isolation
Depressor exports electric current, converts direct current into alternating current output to realize.
In further embodiment, voltage sampling circuit includes voltage transformer and the first operational amplifier, voltage transformer
It is electrically connected with the first operational amplifier, voltage transformer obtains the voltage sampling signal of voltage output end and is sent to the first operation
Amplified voltage sampling signal is sent to governor circuit by amplifier, the first operational amplifier.
It can be seen that voltage sampling circuit by voltage transformer to the voltage of the voltage output end of voltage conversion circuit into
Row acquisition, and processing is amplified by the first operational amplifier to voltage sampling signal, improve the precision of voltage sampling signal.
In further embodiment, current sampling circuit includes current transformer and second operational amplifier, current transformer
It is electrically connected with second operational amplifier, current transformer obtains the current sampling signal of current output terminal and is sent to the second operation
Amplified current sampling signal is sent to governor circuit by amplifier, second operational amplifier.
It can be seen that current sampling circuit by current transformer to the electric current of the current output terminal of current converter circuit into
Row acquisition, and processing is amplified by second operational amplifier to current sampling signal, improve the precision of current sampling signal.
In further embodiment, three-phase virtual load generator further include: temperature sensing circuit, temperature sensing circuit and master control
Circuit electrical connection, temperature sensing circuit obtain the temperature information of voltage conversion circuit or current converter circuit and send out temperature information
It send to governor circuit.
It can be seen that carrying out temperature to voltage conversion circuit or current converter circuit key heat generating member by temperature sensing circuit
Degree sampling, and temperature information is transmitted to governor circuit and is monitored, output can be closed when the temperature is excessively high, to play protection electricity
The effect on road ensures the service life of three-phase virtual load generator.
In further embodiment, three-phase virtual load generator further include: key circuit, key circuit are electrically connected with governor circuit
It connects.
It can be seen that can the output parameter of three-phase virtual load generator be configured or be repaired by setting button circuit
Change.
In further embodiment, three-phase virtual load generator further include: display circuit, display circuit are electrically connected with governor circuit
It connects.
It can be seen that setting display circuit, can carry out real-time display monitoring to the voltage and current that power supply exports.
In further embodiment, DC power supply circuit includes rechargeable battery and reduction voltage circuit, rechargeable battery and decompression
Circuit electrical connection.
It can be seen that realizing the portability of three-phase virtual load generator, while passing through setting drop using rechargeable battery
High voltage direct current can be converted into low-voltage DC by volt circuit, to use the component of low-voltage DC to provide into circuit
Power supply.
Detailed description of the invention
Fig. 1 is the circuit structure block diagram of the utility model three-phase virtual load generator embodiment.
Fig. 2 is the circuit diagram of voltage conversion circuit in the utility model three-phase virtual load generator embodiment.
Fig. 3 is the circuit diagram of current converter circuit in the utility model three-phase virtual load generator embodiment.
Fig. 4 is the circuit diagram of voltage sampling circuit in the utility model three-phase virtual load generator embodiment.
Fig. 5 is the circuit diagram of current sampling circuit in the utility model three-phase virtual load generator embodiment.
Fig. 6 is the circuit diagram of control relay circuit in the utility model three-phase virtual load generator embodiment.
Fig. 7 is the circuit diagram of temperature sensing circuit in the utility model three-phase virtual load generator embodiment.
Fig. 8 is the circuit diagram of DC power supply circuit in the utility model three-phase virtual load generator embodiment.
The following is a further explanation of the present invention with reference to the accompanying drawings and embodiments.
Specific embodiment
As shown in Figure 1, the three-phase virtual load generator of the utility model includes governor circuit 1, DC power supply circuit 2, electricity
Voltage conversion circuit 3, current converter circuit 4, voltage sampling circuit 5, current sampling circuit 6, control relay circuit 7, temperature inspection
Slowdown monitoring circuit 8, key circuit 9, display circuit 10 and communication interface circuit 11.DC power supply circuit 2 is to governor circuit 1, voltage
Conversion circuit 3, current converter circuit 4, voltage sampling circuit 5, current sampling circuit 6, control relay circuit 7, temperature detection
Circuit 8, key circuit 9, display circuit 10 and communication interface circuit 11 provide power supply.
Governor circuit 1 sends the first PWM drive signal to voltage conversion circuit 3, and voltage conversion circuit 3 is according to the first PWM
The converting direct-current voltage into alternating-current voltage that driving signal provides DC power supply circuit 2 exports.Referring to fig. 2, voltage conversion circuit 3
Including the first IGBT circuit module 32, the first LC filter circuit 33 and the first isolating transformer 34, the first IGBT circuit module
32 are electrically connected with governor circuit 1, DC power supply circuit 2 and the first LC filter circuit 33 respectively, the first LC filter circuit 33
Output end is electrically connected with the first isolating transformer 34.Wherein, the first IGBT circuit module 32 can utilize existing IGBT module, use
D. c. voltage signal is converted into the square-wave signal of 50Hz in realization.What the first LC filter circuit 33 was made of inductance and capacitor
LC filter circuit, for square-wave signal to be filtered into smooth sine wave signal.First isolating transformer 34 is existing isolation
Transformer, for being protected to high tension voltage.
Governor circuit 1 sends the second PWM drive signal to current converter circuit 4, and current converter circuit 4 is according to the 2nd PWM
The DC current that DC power supply circuit 2 provides is converted into alternating current output by driving signal.Referring to Fig. 3, current converter circuit 4
Including the 2nd IGBT circuit module 42, the 2nd LC filter circuit 43 and the second isolating transformer 44, the 2nd IGBT circuit module
42 are electrically connected with governor circuit 1, DC power supply circuit 2 and the 2nd LC filter circuit 43 respectively, the 2nd LC filter circuit 43
Output end is electrically connected with the second isolating transformer 44.Wherein, the 2nd IGBT circuit module 42 can utilize existing IGBT module, use
DC current signal is converted into the square-wave signal of 50Hz in realization.What the 2nd LC filter circuit 43 was made of inductance and capacitor
LC filter circuit, for square-wave signal to be filtered into smooth sine wave signal.Second isolating transformer 44 is existing isolation
Transformer, for being protected to high tension voltage.
Voltage sampling circuit 5 obtains the voltage sampling signal of the voltage output end 31 of voltage conversion circuit 3, voltage sample electricity
Voltage sampling signal is sent to governor circuit 1 by road 5.Referring to fig. 4, voltage sampling circuit 5 includes voltage transformer T1 and first
Operational amplifier U1, voltage transformer T1 and the first operational amplifier U1 electrical connection, voltage transformer T1 pass through terminal 51 and end
Son 52 obtains the voltage sampling signal of the voltage output end 31 of voltage conversion circuit 3 and is sent to the first operational amplifier U1, the
Amplified voltage sampling signal is sent to governor circuit 1 by terminal 53 by one operational amplifier U1.By in Fig. 2 it is found that electricity
Voltage conversion circuit 3 exports the out of phase alternating voltage in tri- tunnel Shi, therefore, is both needed to be provided with voltage sample electricity per output end all the way
Road 5 carries out the acquisition of voltage, to monitor.
Current sampling circuit 6 obtains the current sampling signal of the current output terminal 41 of current converter circuit 4, current sample electricity
Current sampling signal is sent to governor circuit 1 by road 6.Referring to Fig. 5, current sampling circuit 6 includes current transformer T2 and second
Operational amplifier U2, current transformer T2 and second operational amplifier U2 electrical connection, current transformer T2 pass through terminal 61 and end
Son 62 obtains the current sampling signal of the current output terminal 41 of current converter circuit 4 and is sent to second operational amplifier U2, the
Amplified current sampling signal is sent to governor circuit 1 by terminal 63 by two operational amplifier U2.From the figure 3, it may be seen that electric current
Conversion circuit 4 exports the out of phase alternating current in tri- tunnel Shi, therefore, is both needed to be provided with current sampling circuit per output end all the way
6 carry out the acquisition of electric current, to monitor.
Control relay circuit 7 is electrically connected with the current output terminal 41 of governor circuit 1 and current converter circuit 4 respectively, main
It controls circuit 1 and sends control signal to control relay circuit 7, control relay circuit 7 is converted according to control signal control electric current
The on or off of the current output terminal 41 of circuit 4.Referring to Fig. 6, control relay circuit 7 includes NPN triode Q1 and NPN tri-
Pole pipe Q2 and relay K, the first end of relay K are electrically connected to a power source, the second end of relay K and the collection of NPN triode Q2
Electrode electrical connection, the emitter ground connection of NPN triode Q2, the base stage of NPN triode Q2 and the collector of NPN triode Q1 are electrically connected
It connects, the emitter ground connection of NPN triode Q1, the base stage of NPN triode Q1 is electrically connected by terminal 71 with governor circuit 1.Relay
The first end and second end of device K is parallel with diode D1, and the first end of relay K and the base stage of NPN triode Q2 pass through resistance
R1 electrical connection.From the figure 3, it may be seen that current converter circuit 4 exports the out of phase alternating current in tri- tunnel Shi, it is therefore, every to export all the way
End is both needed to setting control relay circuit 7 and is controlled, and the switch terminals of relay K are connected to the second isolating transformer 44 and electric current
Between output end 41.
Temperature sensing circuit 8 is electrically connected with governor circuit 1, and temperature sensing circuit 8 obtains voltage conversion circuit 3 or electric current turns
It changes the temperature information of circuit 4 and temperature information is sent to governor circuit 1.Referring to Fig. 7, temperature sensing circuit 8 includes temperature-sensitive electricity
Resistance TE, capacitor C1 and resistance R2, the first end of resistance R2 are electrically connected with DC power supply circuit, the second end and capacitor of resistance R2
The first end of C1 is electrically connected, the second end ground connection of capacitor C1, the both ends of thermistor TE respectively with the first end of capacitor C1 and the
The first end of the electrical connection of two ends, capacitor C1 is electrically connected by terminal 81 with governor circuit.In the present embodiment, temperature sensing circuit 8
It is mainly used in monitoring voltage conversion circuit 3 the 2nd IGBT circuit mould in the first IGBT circuit module 32 and current converter circuit 4
The temperature of block 42 stops working convenient for carrying out power-off control when the temperature is excessively high.The quantity of temperature sensing circuit 8 is the first IGBT
The summation of the quantity of circuit module 32 and the quantity of the 2nd IGBT circuit module 42.Each temperature sensing circuit 8 is one corresponding
IGBT circuit module.
Referring to Fig. 8, DC power supply circuit 2 includes rechargeable battery 21 and reduction voltage circuit 22, rechargeable battery 21 and decompression
Circuit 22 is electrically connected.In the present embodiment, reduction voltage circuit 22 includes the first voltage stabilizing chip U3 and the second voltage stabilizing chip U4, the first pressure stabilizing
The input terminal of chip U3 is electrically connected with rechargeable battery 21, the first voltage stabilizing chip U3 output end and the second voltage stabilizing chip U4 input terminal
Electrical connection.First voltage stabilizing chip U3 is used for the 12V DC voltage step-down that provides rechargeable battery 21 into 3.3V DC voltage, the
The 3.3V DC voltage that two voltage stabilizing chip U4 are used to export the first voltage stabilizing chip U3 is depressured into 3V DC voltage.Certainly, direct current
The also settable booster circuit of power circuit 2 carries out the DC power supply that boosting obtains 15V to the DC power supply of 12V, this principle is this
The common knowledge of field technical staff, details are not described herein.
In addition, key circuit 9 can be used for three-phase void it will be seen from figure 1 that key circuit 9 is electrically connected with governor circuit 1
The output parameter of load generator is configured or modifies.Display circuit 10 is connect with governor circuit electricity 1, and display circuit 10 can be right
The voltage and current of three-phase virtual load generator output carries out real-time display monitoring.Governor circuit 1 passes through communication interface circuit 11
With host computer information exchange, mobile power source is controlled convenient for host computer.Preferably, communication interface circuit 11 is logical for RS232
Believe interface circuit.
At work, governor circuit 1 can be inputted the three-phase virtual load generator of the utility model by obtaining key circuit 9
Power supply output parameter or by communication interface circuit 11 obtain host computer send power supply output parameter, 1 basis of governor circuit
Power supply output parameter sends the first PWM drive signal or sends the 2nd PWM to current converter circuit 4 and drives to voltage conversion circuit 3
Dynamic signal, is converted into voltage conversion circuit 3 by the DC voltage that DC power supply circuit 2 provides according to the first PWM drive signal
The direct current that alternating voltage exports or provides current converter circuit 4 by DC power supply circuit 2 according to the second PWM drive signal
Circulation changes alternating current output into.Meanwhile governor circuit 1 utilizes 5 feedback voltage sampled signal of voltage sampling circuit to the first PWM
Driving signal is adjusted, and governor circuit 1 is using 6 feedback current sampled signal of current sampling circuit to the second PWM drive signal
It is adjusted, so that the electric current that the voltage and current conversion circuit 4 that voltage conversion circuit 3 exports exports is more accurate.In electric current
When conversion circuit 4 exports electric current, the access of electric current output can also be selected by control relay circuit 7, realizes out of phase
Electric current output.In addition, governor circuit 1 also passes through 8 monitoring voltage conversion circuit 3 of temperature sensing circuit or current converter circuit 4
Temperature information, preventing equipment work, to be that temperature is excessively high lead to equipment burnout.In addition, can also be observed in real time by display circuit 10
The voltage and current of output, so that user carries out parameter adjustment in time.
It can be seen from the above, the utility model passes through setting voltage conversion circuit 3 and current converter circuit 4, by DC power supply
The DC power supply of circuit 2 is converted into AC power source, convenient for providing alternating voltage to electric power metering device, mentions for electric power O&M scene
For its necessary test environment.Meanwhile voltage sampling circuit 5 and current sampling circuit 6 is set, voltage conversion circuit 3 is exported respectively
Voltage signal and the current signal that exports of current converter circuit 4 be monitored, and governor circuit 1 is fed back to, convenient for master control electricity
The driving signal that road 1 is exported according to the data point reuse of feedback, and then reach the voltage and electricity of the voltage conversion circuit 3 being precisely controlled
Flow the electric current output of conversion circuit 4.
It should be noted that the above is only the preferred embodiment of the utility model, but the design concept invented is not limited to
It is all to conceive the insubstantial modifications made to the utility model using this in this, also each fall within the protection scope of the utility model
Within.
Claims (9)
1. a kind of three-phase virtual load generator, which is characterized in that including
Governor circuit, DC power supply circuit, voltage conversion circuit, current converter circuit, voltage sampling circuit, current sample electricity
Road, control relay circuit and communication interface circuit, the DC power supply circuit are converted to the governor circuit, the voltage
Circuit, the current converter circuit, the voltage sampling circuit, the current sampling circuit and the communication interface circuit mention
Power supply source；
The governor circuit sends the first PWM drive signal to the voltage conversion circuit, and the voltage conversion circuit is according to institute
The converting direct-current voltage into alternating-current voltage that the first PWM drive signal provides the DC power supply circuit is stated to export；
The governor circuit sends the second PWM drive signal to the current converter circuit, and the current converter circuit is according to institute
It states the second PWM drive signal and the DC current that the DC power supply circuit provides is converted into alternating current output；
The voltage sampling circuit obtains the voltage sampling signal of the voltage output end of the voltage conversion circuit, and the voltage is adopted
The voltage sampling signal is sent to the governor circuit by sample circuit；
The current sampling circuit obtains the current sampling signal of the current output terminal of the current converter circuit, and the electric current is adopted
The current sampling signal is sent to the governor circuit by sample circuit；
The control relay circuit is electrically connected with the governor circuit and the current output terminal respectively, the governor circuit to
The control relay circuit sends control signal, and the control relay circuit controls the electric current according to the control signal
The on or off of output end；
The governor circuit passes through the communication interface circuit and host computer information exchange.
2. three-phase virtual load generator according to claim 1, which is characterized in that
The voltage conversion circuit includes the first IGBT circuit module, the first LC filter circuit and the first isolating transformer, institute
It is electric with the governor circuit, the DC power supply circuit and the first LC filter circuit respectively to state the first IGBT circuit module
Connection, the output end of the first LC filter circuit are electrically connected with first isolating transformer.
3. three-phase virtual load generator according to claim 2, which is characterized in that
The current converter circuit includes the 2nd IGBT circuit module, the 2nd LC filter circuit and the second isolating transformer, institute
It is electric with the governor circuit, the DC power supply circuit and the 2nd LC filter circuit respectively to state the 2nd IGBT circuit module
Connection, the output end of the 2nd LC filter circuit are electrically connected with second isolating transformer.
4. three-phase virtual load generator according to claim 3, which is characterized in that
The voltage sampling circuit includes voltage transformer and the first operational amplifier, and the voltage transformer and described first are transported
Amplifier electrical connection is calculated, the voltage transformer obtains the voltage sampling signal of the voltage output end and is sent to described
The amplified voltage sampling signal is sent to the master control electricity by the first operational amplifier, first operational amplifier
Road.
5. three-phase virtual load generator according to claim 4, which is characterized in that
The current sampling circuit includes current transformer and second operational amplifier, and the current transformer and described second are transported
Amplifier electrical connection is calculated, the current transformer obtains the current sampling signal of the current output terminal and is sent to described
The amplified current sampling signal is sent to the master control electricity by second operational amplifier, the second operational amplifier
Road.
6. three-phase virtual load generator according to any one of claims 1 to 5, which is characterized in that the three-phase virtual load
Generator further include:
Temperature sensing circuit, the temperature sensing circuit are electrically connected with the governor circuit, and the temperature sensing circuit obtains institute
It states the temperature information of voltage conversion circuit or the current converter circuit and the temperature information is sent to the governor circuit.
7. three-phase virtual load generator according to any one of claims 1 to 5, which is characterized in that the three-phase virtual load
Generator further include:
Key circuit, the key circuit are electrically connected with the governor circuit.
8. three-phase virtual load generator according to any one of claims 1 to 5, which is characterized in that the three-phase virtual load
Generator further include:
Display circuit, the display circuit are electrically connected with the governor circuit.
9. three-phase virtual load generator according to any one of claims 1 to 5, which is characterized in that
The DC power supply circuit includes rechargeable battery and reduction voltage circuit, and the rechargeable battery is electrically connected with the reduction voltage circuit
It connects.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820830923.3U CN208569019U (en) | 2018-05-30 | 2018-05-30 | A kind of three-phase virtual load generator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820830923.3U CN208569019U (en) | 2018-05-30 | 2018-05-30 | A kind of three-phase virtual load generator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208569019U true CN208569019U (en) | 2019-03-01 |
Family
ID=65484695
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820830923.3U Active CN208569019U (en) | 2018-05-30 | 2018-05-30 | A kind of three-phase virtual load generator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208569019U (en) |
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2018
- 2018-05-30 CN CN201820830923.3U patent/CN208569019U/en active Active
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